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+.PS
+# ex09.m4
+# Illustrating the arguments of the `dimension_' macro.
+gen_init
+sinclude(F_ex09.dim)
+sinclude(examples.dim)
+s_init(ex09)
+scale = 25
+
+define(`spacer',`
+[
+iflatex(`ifpsfrag(`textht = 7.5bp__; textoffset = 0.5bp__',
+ `latexcommand({\sf)') ')
+linethick_(1.0)
+
+ WC: circle diameter 4.22 at 0,0
+ EC: circle same at 30.15,0
+ NC: circle diameter 2.36 at 13.28, 10.92/2
+ SC: circle same at 13.28,-10.92/2
+
+ C: 0.5<WC,EC> # spacer centre
+ h = 27.26 # spacer height
+ s = 4.22/2 # small arc radius
+ r = h/2*0.80 # large arc radius
+ Cr: C+(0,h/2-r) # upper arc centre
+ e = s # small arc centre offset from small circle
+ Cs: EC+(e,0) # right arc centre
+
+# Tangent points Tr and Ts to circles at Cr and Cs
+ dx = Cr.x-Cs.x; dy = Cr.y-Cs.y; dsq = dx*dx+dy*dy
+ Tr: (r*(r-s)/dsq)<Cr,Cs> + (vscal_(r*sqrt(dsq-(r-s)^2)/dsq,dy,-dx))
+ Ts: (s/r)<Cr,Tr>-(dx,dy)
+
+ line from Tr to Ts
+ arc cw to (Ts.x,-Ts.y) with .c at Cs
+E: last arc.e
+ line to (Tr.x,-Tr.y)
+ arc cw to (C.x-(Here.x-C.x),Here.y) with .c at (Cr.x,-Cr.y)
+S: last arc.s
+ line to (Cs.x-Ts.x-s,Cs.y-Ts.y)
+ arc cw to (Here.x,-Here.y) with .c at (-e,0)
+W: last arc.w
+ line to (C.x-(Tr.x-C.x),Tr.y)
+ arc cw to Tr with .c at Cr
+N: last arc.n
+
+thinlines_
+ dimension_(from S+(2,0) to N+(2,0),-(E.x-C.x+4),s_box(27.76), H)
+ dimension_(from SC.n+(0,2) left SC.x-WC.x, (SC.n.y-S.y+3), s_box(13.28), W)
+ dimension_(from WC.n+(0,2) right EC.x-WC.x,-(WC.n.y-S.y+7), s_box(30.15), W)
+ dimension_(from W+(0,-1.5) to E+(0,-1.5), -(C.y-S.y+8), s_box(41.28), W)
+ dimension_(from SC.e+(2,0) up NC.y-SC.y, (SC.e.x-W.x+8), s_box(10.92), H)
+
+ arrow <- from EC left 6 up 16 chop EC.rad chop 0
+ line left 4 "4.22 (2) PL" above
+ arrow <- from NC up last line.y-NC.y+7/8 left 8 chop NC.rad chop 0
+ {"2.36" above}
+ arrow to SC chop 0 chop SC.rad
+iflatex(`ifpsfrag(,`latexcommand(})')')
+] ')
+
+define(`sk',`scale*0.7')
+
+define(`bdot',
+ `dot(`$1',,0.5)
+ s_box($`$2'$\strut) `$1' `$3' ')
+
+ thinlines_
+# Upper left diagram
+ spacer
+
+# Lower left diagram
+[ define(`lwid',`29bp__')
+A: bdot(at (0,0),A,below)
+B: bdot(at (2*sk,0),B,below)
+Ctr: 0.5 between A and B
+
+ linethick_(1)
+ dimension_(from A to B,0.5*sk,\sl label,lwid,0.1*sk)
+ s_box(`\tt dimension\_(from A to B,0.5,\char92 sl label,29bp\_\_,0.1)') \
+ with .sw at A+(-0.8*sk,-0.7*sk)
+
+ thinlines_
+ arrow from A to B chop 0.05*sk "\sl linespec" below
+ dimension_(up_ 0.5*sk from A,0.2*sk,"\sl offset\ {}" rjust,,,->)
+ dimension_(up_ 0.1*sk from B,-0.2*sk)
+ s_box(\ \sl tic offset) with .nw at 2nd last arrow
+ dimension_(up_ 0.1*sk from B+(0,0.5*sk),-0.2*sk)
+ s_box(\ \sl tic offset) with .nw at 2nd last arrow
+ dimension_(from Ctr+(-lwid/2,0.5*sk) right lwid,0.2*sk,
+ "\strut\sl blank width" above)
+ move up 1*sk from A
+] with .nw at last [].sw+(0,-0.6*sk)
+
+# Right diagram
+[ A: bdot(at (0,0),A, above rjust)
+ B: bdot(at (2*sk,0),B, above ljust)
+ C: bdot(at (0,-1.5*sk),C, above rjust)
+ D: bdot(at (2*sk,-1.5*sk),D, above ljust)
+
+T: C+(-1*sk,-0.5*sk)
+T: C+(-0.45*sk,-1.0*sk)
+ dimension_(from A to B,0.3*sk,$AB$,20bp__)
+
+ s_box(`\tt dimension\_(from A to B,0.3,\$AB\$,20bp\_\_)') \
+ with .sw at T
+
+ dimension_(from C to B chop dotrad_,,$X$,16bp__)
+ s_box(`\tt dimension\_(from C to B,,\$X\$,16bp\_\_)') \
+ with .sw at T+(0,-13bp__)
+
+ dimension_(from C to A,0.3*sk,$CA$,14bp__,,->)
+ s_box(`\tt dimension\_(from C to A,0.3,\$CA\$,14bp\_\_,,->)') \
+ with .sw at T+(0,-2*13bp__)
+
+ dimension_(from D to B,-0.3*sk,"$DB$" ljust)
+ s_box(`\tt dimension\_(from D to B,-0.3,\"\$DB\$\" ljust)') \
+ with .sw at T+(0,-3*13bp__)
+
+ dimension_(from C to D chop dotrad_,,s_box($T^{%g}$,15),W)
+ s_box(
+ `\tt dimension\_(from C to D,,s\_box(\$T\char94\char123\%g\char125\$,15),W)')\
+ with .sw at T+(0,-4*13bp__)
+
+ arcdimension_(from C to D with .c at \
+ 0.5 between A and B,12bp__,s_box($C$ to $D$),W)
+ s_box(
+ `\tt arcdimension\_(from C to D with .c at \smash{\char92}') \
+ with .sw at T+(0,-5*13bp__)
+ s_box(`\tt 0.5 between A and B,12bp\_\_,s\_box(\$C\$ to \$D\$),W)') \
+ with .sw at T+(5,-6*13bp__)
+
+] with .nw at 1st [].ne+(0.8*sk,0)
+
+.PE